Which rhythm typically has a heart rate between 40-100 BPM, wide QRS complex, and absent P waves?

The rhythm characterized by a heart rate between 40-100 BPM, wide QRS complex, and absent P waves is known as Accelerated Idioventricular Rhythm (AIVR). This rhythm usually occurs in settings where the ventricular myocardium takes over pacing due to the failure of higher pacemakers (like the sinoatrial node).

In AIVR, the wide QRS complex indicates that the impulse is originating from the ventricle rather than the atria, which is why P waves are absent. The heart rate is typically within the specified range, differentiating it from more rapid ventricular rhythms like Ventricular Tachycardia, which features a similar QRS morphology but with a higher heart rate.

Understanding these characteristics helps in identifying AIVR and distinguishing it from other rhythms that may have overlapping features. For instance, Atrial Fibrillation typically presents with an irregularly irregular rhythm and does not have consistent QRS complexes, nor does it feature the wide QRS complexes seen in AIVR. Ventricular Fibrillation is a chaotic rhythm with no measurable heart rate or organized electrical activity and is life-threatening. Normal Sinus Rhythm is characterized by a regular rhythm, normal heart rate, and identifiable P waves preceding